Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01f6dbb0eecd736…

MALICIOUS

PDF

75.2 KB Created: 2021-09-08 21:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab3ee3efd24215c10dd6642c5276cb9a SHA-1: a4958e17b3b3ff3bc56b345219f326eb31b4d852 SHA-256: c01f6dbb0eecd7367d289a876773cc927d155bd05d73edf32ccfd44159b78477
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including one pointing to 'infrive.ru', suggests a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=enhanced+oil+recovery+green+willhite+pdf PDF link annotation
    • http://analhospital.net/file/files/fapekavawa.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/ramumazegesubizakinolog.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/4749804954.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/28854731775.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c08062b2b9daf7bb1c2ab0c1eb20cd4d/59232831703.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/josopop.pdfIn PDF document text
    • http://ktcz.eu/files/files/sawezupevavikisupowiw.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/jukipizivexowupese.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/72387636183.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/bepalumibupalujewefukiti.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/6559229757.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/kimoku.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/86020348361.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/gikonemufeke.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109011956537253.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109032038081721.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jizewuzajovixekilok.pdfIn PDF document text
    • http://hrudolf.com/userfiles/47657913814.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/lejutanusup.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/muredotedusevuxoxuripob.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/34342637785.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/gofikikigedamariviwizedun.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e9a30f99476e2ffbc3efd0b5f0858314/xubotodubunurodepime.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/gubulonof.pdfIn PDF document text
    • https://novsport.com/content/File/kuzadarek.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/50245607848.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC232 10980 bytes
SHA-256: 352b7b0c36517a5eb2fbdcdbddcbc475563e47fc76c98cfae175dc400f0b64d2
font_01_sfnt_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 16592 bytes
SHA-256: 90656fb0fc7b767a18fa9fe4bcf542d9436098fc9602be102e081d6f9c2c8d06
font_02_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1